Identifying ceRNA associated four-gene signature for HCC survival: (a) the trajectory for each independent variable. The horizontal axis represents the log value of the independent variable lambda, and the vertical axis represents the coefficient of the independent variable, (b) the confidence interval for each lambda, (c) risk score, survival time and survival status, and expressions of 4-mRNAs in TCGA training set, (d) ROC curve and AUC of the 4-mRNAs signature, and (e) KM survival curves distribution of 4-mRNA signature in the TCGA training set.